Hadronic molecules in chiral dynamics

Hadrons are composed of quarks and gluons through the strong interaction. When the hadrons themselves are strongly correlated by the inter-hadron forces, a composite system of hadrons can be formed. This is called hadronic molecule state. We present recent developments in the study of the structure of such hadrons in chiral dynamics. It is shown that the novel structure of hadronic molecules can be realized by the strong attraction in chiral low energy interaction.